The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 24, 1993
Filed:
Nov. 25, 1991
Yasuhiro Mitsuyoshi, Kanagawa, JP;
Kazuhiro Taki, Kanagawa, JP;
Nippon Mining and Metals Company Limited, Tokyo, JP;
Abstract
The invention provides (1) a titanium alloy with excellent corrosion resistance consisting essentially of 10-40 wt % of Mo, 0.1-15 wt % of Cr, and the balance of Ti and unavoidable impurities and (2) a titanium alloy according to (1) which further contains 0.01-2.0 wt % (in total) of Ru, Ir, Os, Pd, Pt, or/and Rh. The addition of Mo allows Ti-based alloys to form on the surface a protective film with a high concentration of Mo, whereby their corrosion resistance in non-oxidizing acids, such as hydrochloric and sulfuric acids, is markedly improved. In environments where oxidants are present, even but a few ppm in amount, Mo comes out in solution, seriously affecting the corrosion resistance of the alloys. To avoid this, Cr must also be added. The addition of Cr helps keep Mo from dissolving out and thereby prevent the deterioration of corrosion resistance by the action of oxidants in the environments. The platinum group elements, singly or in combination, further improve the corrosion resistance.